As a pioneer in vacuum pump manufacturing, Nash has expanded our historic liquid ring product portfolio to include additional vacuum technologies such as rotary vane vacuum pumps. The Nash NRV Series of oil-lubricated rotary vane vacuum pumps presents the broadest range of vane pumps on the market with capacities of up to 900 cfm. The flexibility and durability of the NRV Series make these pumps suitable for applications requiring vacuum levels well below 1 Torr.  

With an efficient, air-cooled design with low-wearing vanes, the NRV Series demonstrates reliable performance for a wide range of industrial applications including automation, power, plastics, and food & beverage.

Rotary Vane Vacuum Pumps - NRV Series by Nash

The NRV Series of rotary vane vacuum pumps feature flanged motors, bearings on both sides of the rotor, and oil/air heat exchangers. Fitted as standard with a fine mesh filter, vacuum non-return valve, gas ballast valve, protection cover, and oil separator. Versions for the handling of gases with elevated oxygen content as well as versions with high water vapor tolerance for vacuum drying are available. 


Advantages of Rotary Vane Vacuum

Incorporating an oil-lubricated rotary vane vacuum pump into your industrial vacuum systems can be a suitable and cost-efficient alternative to liquid ring vacuum pumps, depending on the application.

Along with notable benefits like high-efficiency performance with low cost of ownership, vane pumps in the NRV Series offer several design and performance features for a variety of industrial applications. 

Nash Rotary Vane Vacuum Pump - NRV Series - NRV1100



Vane Pumps - Features and Benefits

Nash specializes in the design of custom vacuum systems built for unique process requirements. Our rotary vane vacuum systems are based on standard components, but specifications and system design can vary depending on your requirements.  


  • Air-Cooled, Compact Design
  • O-Ring Sealed Compression Chamber
  • Long-life Vanes
  • Easy Maintenance 
  • Cost-Efficient & Affordable 
  • Quiet Operation
Nash Rotary Vane Pump - Cutaway - NRV100


The Nash Difference

Nash offers unparalleled expertise in the design and manufacturing of vacuum pump systems. The NRV Series is available as a bare pump or as an incorporated component in a custom-engineered vacuum solution package suited for your unique process requirements. Offering a wide portfolio of bare pumps and custom engineered-to-order systems, you can count on Nash to provide a reliable and efficient vacuum system engineered for any demand of tough industrial applications. Find the right solution for your application needs by contacting Nash today.

Applications & Industries 

Rotary vane vacuum pumps offer versatile performance benefits within a wide range of applications and industries. NASH engineers commonly incorporate vane pumps into our custom, engineered-to-order vacuum systems for optimal performance within unique systems. Vane pumps are an increasingly popular and sustainable choice within the automation, plastics, laboratory service, food and beverage, metallurgy, and power industries. 

How Do Rotary Vane Systems Work?

Rotary vane pumps operate by expanding volume at the inlet and compressing that volume at the exhaust. This is accomplished by placing the rotor eccentrically inside of the cylindrical housing, such that it is nearly touching the housing at the top, and is distanced from the bottom, as can be seen in the graphic. This rotor houses the vanes, and when it spins, centrifugal force causes these vanes to be slung out of the grooves they sit in until they contact the cylinder wall. When the vanes are in this extended position, they create an effective gas barrier that splits the pump cavity into multiple sections.

NRV inside diagram rotary vane vacuum pump

As they rotate, the sections exposed to the inlet port will continually be expanding, and the sections exposed to the exhaust port will continually be contracting. This causes the process gas to be drawn into the inlet, compressed within the pump, and expelled out the exhaust port. As the vanes are physically in contact with the cylinder wall, lubrication is required. This lubrication also aids sealing between the sections of the cylinder, as well as facilitates heat transfer away from the site of compression. These actions combine in a way that allows oil-lubricated rotary vane pumps to be capable of very low base pressures, and as such, they are suitable for applications requiring vacuum levels as low as 0.375 Torr.

Nash Rotary Vane Pump Model

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